It turned out the app doesn't depend on system FFmpeg as it has it own FFmpeg v4.4.2
Problem is solved by installing another app version.
Btw, i recommend everyone to use that application except Claus coz he doesn't like it
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It uses Opengl render and it supports audio forwarding via Wifi.
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1st click on install sndcpy - start audio then your phone sound will be forwarded to your computer.